/*
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */
#include "dns.h"

#include "lwip/opt.h"

#if LWIP_NETCONN

#include "lwip/sys.h"
#include "lwip/api.h"
#include "lwip/dns.h"

#include <string.h>

#define RECV_BUFSZ      300

/*-----------------------------------------------------------------------------------*/

static void
dns_thread(void* arg)
{
    struct netconn* conn, *newconn;
    err_t err;
    ip4_addr_t dns_ip;

    char* recvbuf;

    recvbuf = (char*) pvPortMalloc(RECV_BUFSZ);
    if (!recvbuf) return ;

    LWIP_UNUSED_ARG(arg);

    /* Create a new connection identifier. */
    /* Bind connection to well known port number 5001. */
#if LWIP_IPV6
    conn = netconn_new(NETCONN_TCP_IPV6);
    netconn_bind(conn, IP6_ADDR_ANY, LOCAL_PORT);
#else /* LWIP_IPV6 */
    conn = netconn_new(NETCONN_TCP);
    netconn_bind(conn, IP_ADDR_ANY, LOCAL_PORT);
#endif /* LWIP_IPV6 */
    LWIP_ERROR("tcpecho: invalid conn", (conn != NULL), return;);

    printf("Please set the computer as client in the computer's host computer software, and connect to the development board...\n\n");
    printf("Please set the host computer of the computer to TCP Client. And connect to the development board, the development board IP address is:%d.%d.%d.%d \t The port number:%d\n\n", \
           IP_ADDR0, IP_ADDR1, IP_ADDR2, IP_ADDR3, LOCAL_PORT);

    /* Tell connection to go into listening mode. */
    netconn_listen(conn);

    while (1) {

        /* Grab new connection. */
        err = netconn_accept(conn, &newconn);
        /*printf("accepted new connection %p\n", newconn);*/
        /* Process the new connection. */
        if (err == ERR_OK) {
            struct netbuf* buf;
            void* data;
            u16_t len;

            sprintf(recvbuf, "The connection is successful...Please send a domain name for dns resolution...\n\n");
            printf("%s", recvbuf);

            netconn_write(newconn, recvbuf, strlen(recvbuf), NETCONN_COPY);

            while ((err = netconn_recv(newconn, &buf)) == ERR_OK) {
                do {
                    netbuf_data(buf, &data, &len);
                    if(len == 0)
                        continue;

                    memset(recvbuf, 0, RECV_BUFSZ);
                    memcpy(recvbuf, data, len);

                    err = netconn_gethostbyname(recvbuf, &dns_ip);
                    if(err == ERR_OK) {
                        len = sprintf(recvbuf, "%s = %s\n", recvbuf, ip_ntoa(&dns_ip));
                        printf("%s", recvbuf);
                        netconn_write(newconn, recvbuf, len, NETCONN_COPY);
                    }
                    else {
                        len = sprintf(recvbuf, "get host name fail...\n");
                        printf("%s", recvbuf);
                        netconn_write(newconn, recvbuf, len, NETCONN_COPY);
                    }


                } while (netbuf_next(buf) >= 0);
                netbuf_delete(buf);
            }
            /*printf("Got EOF, looping\n");*/
            /* Close connection and discard connection identifier. */
            netconn_close(newconn);
            netconn_delete(newconn);
            printf("The line is disconnected....\n\n");
        }
    }
}
/*-----------------------------------------------------------------------------------*/
void
app_dns_init(void)
{
    sys_thread_new("dns_thread", dns_thread, NULL, 512, 4);
}
/*-----------------------------------------------------------------------------------*/

#endif /* LWIP_NETCONN */
